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DeWelopeTools

Decagon Calculator

Calculate area, perimeter, apothem, and diagonal count of a regular decagon (10-sided polygon) from its side length.

How to Use Decagon Calculator

The Decagon Calculator computes all properties of a regular decagon (10-sided polygon) from its side length. Enter the side length and instantly get the perimeter, area, apothem (distance from center to midpoint of a side), number of diagonals (35), and interior angle (144Ā°). Uses the formula A = (5/2) Ɨ sĀ² Ɨ āˆš(5 + 2āˆš5) for area calculation. Useful for geometry students, architects, designers working with decagonal shapes, and anyone studying regular polygons.

Step-by-Step Instructions

  1. Enter the side length of the regular decagon
  2. Click Calculate
  3. View area, perimeter, apothem, and other properties
  4. Copy the results for your calculations

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